Simply put, the remaining 90% of the funds are mortgaged by your credit, that is, the margin monitoring center and the futures company will monitor your positions and margins. When your position has suffered a serious loss, the futures company will let you increase or decrease your position when the position margin can no longer make up for the loss. To put it bluntly, although you bought 100% with 100%, you have no chance to lose more than 10% because you have already reduced your position by force.